Appert Lake Dam Reservoir Report
Nearby: Temvik Dam Braddock Dam
Last Updated: December 13, 2025
Appert Lake Dam, located in Emmons County, North Dakota, is a Federal-owned structure that serves as a Fish and Wildlife Pond.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1930, this Earth-type dam stands at a height of 10 feet and stretches 520 feet in length. It has a storage capacity of 978 acre-feet and covers a surface area of 76 acres. The dam is regulated by the North Dakota State Water Commission and is inspected periodically to ensure its safety and compliance with state regulations.
Despite its low hazard potential, the dam's condition assessment in 2016 revealed poor structural conditions, prompting modifications in 2000, 2002, 2004, and 2007 to address hydraulic concerns. The dam's spillway, with a width of 30 feet, is uncontrolled, allowing for a maximum discharge of 800 cubic feet per second. With a drainage area of 11.6 square miles, the dam plays a crucial role in managing water resources in the region and supporting wildlife habitats. While the dam's risk assessment is moderate, ongoing risk management measures are essential to safeguard the surrounding community and environment from potential hazards associated with the dam.
Years Modified |
2000 - Structural, 2002 - Hydraulic, 2004 - Other, 2007 - Hydraulic |
Year Completed |
1930 |
Dam Length |
520 |
Dam Height |
10 |
River Or Stream |
W BRANCH, LONG LAKE CREEK-TR |
Primary Dam Type |
Earth |
Surface Area |
76 |
Hydraulic Height |
10 |
Drainage Area |
11.6 |
Nid Storage |
978 |
Structural Height |
10 |
Hazard Potential |
Low |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Beaver Creek Bl Linton
|
39cfs |
Long Lake Cr Below Long Lake Nr Moffit
|
95cfs |
Apple Creek Nr Menoken
|
59cfs |
Hay Creek At Main Avenue In Bismarck
|
3cfs |
Cannonball River At Breien
|
96cfs |
Missouri River At Bismarck
|
16700cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Appert Lake Dam